While the OBC is displaying the time, press the S/R button. This will toggle the hourly chime on and off and the indicator in the upper right corner of the dispay will illuminate. I don't know about the speed limit chime.

Mike91 525i

I reciently noticed that my OBC is not chiming like it used to for lets say on the hour chimes or max speed chimes. I have pulled the battery a few times since, no change. The regular chime when I leave the keys in the ignition and open the door is still there, the other seems like its not activated. help?Thanks.-Chris Adams1990 525iA Cara